"It's a little bit of a concern, but I'm glad to be back home," said Terry Smith.

Crews tested the air quality in each home before letting people return.

An all clear is all Eugene Camp wanted to hear after a very stressful week.

"They closed my shop. I've been out of work and out of my house since Friday," said Camp.

Camp is one of many people relying on a good night's sleep to help them emotionally and mentally bounce back.

"I'll feel much better tomorrow morning," he said.

Into the night, one-by-one, evacuees got the news they had been waiting for.

Some were overjoyed and not afraid to show it.

"Hallelujah!"

Anyone with lingering health concerns are asked to call 857-599-5154. That line will be manned by health professionals.

Many residents have been out of their homes since last Friday, when a freight train derailed rupturing a tanker full of vinyl chloride.

More than 70 people were hospitalized and hundreds were evacuated.

Residents were not allowed into their homes until an air sample indicated no presence of harmful vapors and so far, they've been getting the all clear.

"For several days we've had zero readings of vinyl chloride at the site an in the community," said Captain Kathy Moore of the U.S. Coast Guard.

It has been a long, difficult week for the town and many including Mayor Jeffery Hamilton, complain that they've been kept in the dark.

"Now, communication is a lot better than it was because they weren't communicating to the community and that was the biggest problem," said Mayor Hamilton.

The paths of communication are open but some residents still aren't feeling very secure.

A few of the tankers still in the water are filled with vinyl chloride and there is a danger that one of them might rupture as it's being moved.

"I live right there in front of everything. I don't understand how we're going home and there's still a tanker in the water. What if they try to pull it out and it explodes. What are they going to do about that?" said Yasmeen Stafford.

Meanwhile the National Transportation Safety Board's investigation into the derailment continues.

Earlier Friday, the NTSB said it has completed the on-site portion of their inquiry into a wreck.

The NTSB says it will have a preliminary report completed in about two weeks.